batgrbproduct analysis for trigger=889748
batgrbproduct Analysis for Trigger=889748
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Wed Feb 20 20:02:31 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger889748/GCN5_download_cron
======================================================================
Trigger: 00889748 Segment: 000
BAT Trigger Time: 572297960.448 [s; MET]
Trigger Stop: 572297964.544 [s; MET]
UTC: 2019-02-19T19:38:58.002900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 189.757083789005 Dec: 76.6139916242753 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.13
Image Trigger?: NO
Rate S/N Ratio: 8.54400374531753 [ if not an image trigger ]
Image S/N Ratio: 10.13
Flight Position: [ source = BAT ]
RA: 189.757083789005 Dec: 76.6139916242753 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 189.686246234948 Dec: 76.6060136840161 [deg; J2000]
{ 12h 38m 44.7s , +76d 36' 21.6" }
+/- 1.62731994591771 [arcmin] (estimated 90% radius based on SNR)
+/- 0.714505975754242 [arcmin] (formal 1-sigma fit error)
SNR: 15.1709986307957
Angular difference between Flight and Ground position is 1.094490 arcmin
Partial Coding Fraction: 0.765625 [ including projection effects ]
Duration
T90: 167.84399998188 +/- 12.8003112495262
Measured from: -89.327999830246
to: 78.5160001516342 [s; relative to TRIGTIME]
T50: 62.4999998807907 +/- 2.45610753560811
Measured from: 3.70800018310547
to: 66.2080000638962 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 65.5240000486374
to: 66.5240000486374 [s; relative to TRIGTIME]
Total Fluence
Measured from: -106.203999996185
to: 88.6840000152588 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.140053 2.921996 1.268415 0.286897
0.108811 0.112187 0.095754 0.083996 [error]
Peak 0.092986 0.087792 0.030096 0.007256
0.008210 0.008304 0.006693 0.005298 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 1.06e-06 1.24e-06 1.06e-06 1.52e-06 3.90e-06 4.88e-06 erg/cm2
Error 8.00e-08 6.05e-08 9.47e-08 2.75e-07 2.11e-07 3.72e-07 erg/cm2
Peak flux Power-law 9.49e-01 6.36e-01 2.78e-01 1.68e-01 1.95e+00 2.03e+00 ph/cm2/s
Error 1.37e-01 6.99e-02 5.41e-02 6.00e-02 2.10e-01 2.20e-01 ph/cm2/s
Fluence Cutoff-PL 1.01e-06 1.29e-06 1.03e-06 7.86e-07 3.75e-06 4.12e-06 erg/cm2
Error 9.31e-08 7.65e-08 1.04e-07 -------- 2.58e-07 6.32e-07 erg/cm2
Peak flux Cutoff-PL 9.20e-01 6.81e-01 2.68e-01 7.32e-02 1.92e+00 1.94e+00 ph/cm2/s
Error 1.48e-01 1.01e-01 6.63e-02 1.12e-01 2.14e-01 2.42e-01 ph/cm2/s
Fluence Band 1.00e-06 1.29e-06 1.03e-06 7.88e-07 3.74e-06 4.12e-06 erg/cm2
Error 9.17e-08 -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.236 0.104 - - 2.12e-03 1.34e-04 48.970 57
CPL 1.850 0.295 16.4 15.6 3.49e-03 0.00e+00 46.190 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.193 0.205 - - 1.18e-02 1.75e-03 57.630 57
CPL 1.649 0.714 24.8 19.4 2.54e-02 0.00e+00 56.530 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 170.816000 sec.
T50 in the 50-300 keV band: 107.968000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 194.888 -106.204 88.684
T90 167.844 -89.328 78.516
T50 62.500 3.708 66.208
Peak 1.000 65.524 66.524
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
189.6862 +76.6060 0.0127 26.9 -142.9 3.9697 15.2 TRIG_00889748
------------------------------------------
Foreground time interval of the image:
-106.204 35.253 (delta_t = 141.457 [sec])
Background time interval of the image:
-239.448 -106.204 (delta_t = 133.244 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -106.204 sec. to 88.684 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.23648 ( -0.102187 0.105006 )
Norm@50keV : 2.11684E-03 ( -0.000134567 0.000132989 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.97 using 59 PHA bins.
# Reduced chi-squared = 0.8592 for 57 degrees of freedom
# Null hypothesis probability = 7.663960e-01
Photon flux (15-150 keV) in 194.9 sec: 0.357309 ( -0.0181045 0.0181531 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90014e-06 ( -2.10599e-07 2.12379e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -106.204 sec. to 88.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84951 ( -0.438347 0.151809 )
Epeak [keV] : 16.4330 ( -15.434 15.8643 )
Norm@50keV : 3.49393E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8247 for 56 degrees of freedom
# Null hypothesis probability = 8.222230e-01
Photon flux (15-150 keV) in 194.9 sec: 0.348588 ( -0.020012 0.020053 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.74705e-06 ( -2.55709e-07 2.60737e-07 ) ergs/cm2
Band function
Time interval is from -106.204 sec. to 88.684 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.84940 ( -0.195322 0.165654 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 16.4396 ( -8.62501 15.8683 )
Norm@50keV : 3.49335E-03 ( -0.000798186 0.00263292 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8397 for 55 degrees of freedom
# Null hypothesis probability = 7.954708e-01
Photon flux (15-150 keV) in 194.9 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.74148e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.35884 ( )
R^2/D10^2 : 0.195273 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 132.14 using 59 PHA bins.
# Reduced chi-squared = 2.3183 for 57 degrees of freedom
# Null hypothesis probability = 6.660672e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.614e-07 5.944e-08
25- 50 1.493e-06 8.030e-08
50-150 6.410e-07 9.384e-08
15-150 2.795e-06 1.549e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 49.7374 (-6.55385 8.38516)
Norm : 1.96530 (-0.177558 0.21453)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.00 using 59 PHA bins.
# Reduced chi-squared = 0.8771 for 57 degrees of freedom
# Null hypothesis probability = 7.329964e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.354e-07 6.500e-08
25- 50 1.341e-06 6.870e-08
50-150 1.295e-06 1.842e-07
15-150 3.572e-06 2.144e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.08368 (-0.755283 0.816722)
R1^2/D10^2 : 1.65912 (-0.738124 1.61646)
kT2 [keV] : 16.7265 (-2.37924 3.28931)
R2^2/D10^2 : 1.40589E-02 (-0.00749581 0.0133008)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.57 using 59 PHA bins.
# Reduced chi-squared = 0.8468 for 55 degrees of freedom
# Null hypothesis probability = 7.835143e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.968e-07 1.897e-07
25- 50 1.256e-06 1.720e-07
50-150 1.386e-06 3.313e-07
15-150 3.639e-06 5.789e-07
Peak spectrum fit
Power-law model
Time interval is from 65.524 sec. to 66.524 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19295 ( -0.197886 0.212058 )
Norm@50keV : 1.17967E-02 ( -0.00176864 0.0017274 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.63 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 57 degrees of freedom
# Null hypothesis probability = 4.517488e-01
Photon flux (15-150 keV) in 1 sec: 1.94578 ( -0.20991 0.209924 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10805e-07 ( -1.43118e-08 1.45904e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 65.524 sec. to 66.524 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64947 ( -1.12451 0.302823 )
Epeak [keV] : 24.7870 ( -22.3377 16.4287 )
Norm@50keV : 2.54344E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.53 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 56 degrees of freedom
# Null hypothesis probability = 4.551145e-01
Photon flux (15-150 keV) in 1 sec: 1.92051 ( -0.214 0.21368 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0485e-07 ( -1.64614e-08 1.7381e-08 ) ergs/cm2
Band function
Time interval is from 65.524 sec. to 66.524 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.92280 ( -14.6841 -4.9228 )
beta : -2.35452 ( -0.356618 0.246847 )
Epeak [keV] : 21.0608 ( -4.31207 3.64074 )
Norm@50keV : 6331.30 ( -678.167 91411.4 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.77 using 59 PHA bins.
# Reduced chi-squared = 0.9958 for 55 degrees of freedom
# Null hypothesis probability = 4.833782e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06892e-07 ( -1.06885e-07 -1.47996e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.30547 (-1.01448 1.15348)
R^2/D10^2 : 1.86023 (-0.753397 1.27601)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.16 using 59 PHA bins.
# Reduced chi-squared = 1.248 for 57 degrees of freedom
# Null hypothesis probability = 9.837245e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.382e-08 4.245e-09
25- 50 4.446e-08 6.650e-09
50-150 1.319e-08 4.174e-09
15-150 8.147e-08 1.274e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 46.8315 (-11.7809 18.1183)
Norm : 11.5171 (-2.0709 2.71145)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.75 using 59 PHA bins.
# Reduced chi-squared = 0.9957 for 57 degrees of freedom
# Null hypothesis probability = 4.843402e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.771e-08 3.920e-09
25- 50 3.886e-08 5.015e-09
50-150 3.542e-08 1.081e-08
15-150 1.020e-07 1.484e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.82365 (-1.93755 2.0598)
R1^2/D10^2 : 5.97716 (-3.76159 18.7333)
kT2 [keV] : 19.2783 (-8.02935 179.356)
R2^2/D10^2 : 3.80381E-02 (-0.0354154 0.34749)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.41 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.221168e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.854e-08 1.165e-08
25- 50 3.750e-08 1.604e-08
50-150 3.873e-08 2.298e-08
15-150 1.048e-07 4.175e-08
Plot creation:
Wed Feb 20 20:06:12 EST 2019